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A085273
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Difference between n-th composite number and its largest prime divisor.
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2
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2, 3, 6, 6, 5, 9, 7, 10, 14, 15, 15, 14, 11, 21, 20, 13, 24, 21, 25, 30, 22, 17, 28, 33, 19, 26, 35, 35, 33, 40, 23, 45, 42, 45, 34, 39, 51, 44, 49, 38, 29, 55, 31, 56, 62, 52, 55, 51, 46, 63, 69, 37, 70, 57, 66, 65, 75, 78, 41, 77, 68, 43, 58, 77, 85, 78, 69, 62, 47, 76, 93, 91
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,1
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EXAMPLE
| For 91=7*13 we have 91-13 = 78
For 92=2*2*23 we have 92-23 = 69
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PROG
| (PARI) cminusp2(n) = { for(x=2, n, forstep(p=x, 2, -1, if(isprime(p) & x%p==0 & isprime(x)==0, print1(x-p, ", "); break); ) ) }
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CROSSREFS
| Cf. A085271.
Sequence in context: A124498 A197334 A113399 * A151850 A078706 A077082
Adjacent sequences: A085270 A085271 A085272 * A085274 A085275 A085276
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KEYWORD
| easy,nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Aug 12 2003
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